Heat developable image recording material

Abstract

A heat developable image recording material including a photosensitive silver halide, a reducing agent for silver ions, a binder and non-photosensitive organic acid silver salt particles on one side of the surface of a substrate. A content of silver behenate in the non-photosensitive organic acid silver salt particles is 90 mol % to 100 mol %, and at least one kind of mercapto compound is contained in a surface of the substrate at the same side as a layer having the photosensitive silver halide. The heat developable image recording material includes a compound represented by following the general formula (1) wherein, R<21>, R<22 >and R<23 >each independently represent a substituted or non-substituted alkyl group. When R21, R<22 >or R<23 >have a substituent, the substituent is a halogen atom etc. The non-photosensitive organic particles are prepared from organic acids including at least behenic acid and erucic acid, and a content of the erucic acid is 0.000001 mol % to 0.4 mol %.

Description

[0001] 1. Field of the Invention[0002] The present invention relates to a heat developable photosensitive image recording material (simply referred to as a heat developable photosensitive material hereinafter).[0003] 2. Description of the Related Art[0004] Reduction of the amount of waste after development and fixing of films for medical diagnostics and photographic printing has been strongly demanded in recent years in view of environmental preservation and for saving work spaces. Accordingly, technologies related to heat developable photosensitive materials are urgently required for providing films for medical diagnosis and photographic printing, by which efficient exposure is possible using a laser image setter or laser imager to form clear images with high resolution and sharpness. No liquid chemicals are needed for development and fixing when the heat developable photosensitive material is used, making it possible to supply to customers a heat development system that is more si...

AI Technical Summary

Benefits of technology

[0145] An alkyl group, an aryl group, an alkoxy group and an aryloxy group are preferable as R.sup.21, R.sup.22 and R.sup.23. It is preferable in terms of the effect of the invention that at least one of R.sup.21, R.sup.22 and R.sup.23 is an alkyl group or an aryl group, and it is more preferable that at least two of them are alkyl or aryl groups. Preferably, groups represented by R.sup.21, R.sup.22 and R.sup.23 are the same groups for purchasing the reagents with cheap price.

[0146] While examples (exemplified compounds 3-1 to 3-17) of the compounds capable of forming hydrogen bonds such as the compounds represented by the general formula (3) in the invention, the invention is not restricted thereto. 202122

[0147] Examples of the hydrogen bond forming compounds other than those described above are described in EP NO. 1096310, and Japanese Patent Application Nos. 2000-270498 and 2000-124796.

[0148] The compound represented by the general formula (3) to be used in the invention may be used in the photosensitive material by adding in an application fluid in any form such as in solution, in emulsified dispersion and solid micro-dispersion as in the case of the reducing agent. The compounds form hydrogen bonding complexes with compounds having phenolic hydroxyl groups or amino groups, and the complex may be isolated in a crystalline state depending on the combination between the reducing agents and the compounds represented by the general formula (3). For obtaining stable performance, it is particularly preferable to use the crystalline powder isolated as described above as a dispersion of solid fine particles. In a different metod preferably used, the reducing agent and the compound represented by the general formula (3) are mixed as powders, and the complex is formed when they are dispersed with a sand grinder mill using an appropriate dispersing agent.

[0149] The compound represented by the general formula (3) is preferably used in a range of 1 to 200 mol %, more preferably in the range of 10 to 150 mol %, and still more preferably in the range of 30 to 100 mol %, relative to the reducing agent.

[0150] The halogen composition of the photosensitive silver halide to be used in the invention is not particularly restricted, and silver chloride, silver chlorobromide, silver bromide, silver iodobromide and silver iodochlorobromide may be used. Silver bromide and silver iodobromide are preferable among them. Distribution of the halogen composition in the particles may be uniform, may be discretely changed, or may be continuously changed. Silver halide particles having a core-shell structure may be preferably used. Preferably used core-shell structures include double to five-fold structures, more preferably double to four-fold structures. Preferably, a technology can be applied in which silver bromide or silver iodide is localized on the surface of the silver chloride, silver bromide or silver chlorobromide particles.

Problems solved by technology

Although various hard copy systems taking advantage of pigments and dyes, such as ink-jet printers and electrophotographic systems, are commercially available today, none of them are satisfactory as output systems for obtaining medical images.

Accordingly, although it is necessary to reduce the size of the silver halide particle and increase the number of particles while compensating its sensitivity by applying chemical sensitization, it was a problem that preservative property of row photosensitive materials are deteriorated and sensitivity decreases during preservation.

However, when the preservation conditions are very severe for the heat developable photosensitive material, for example when processed films are placed in a vehicle for transportation or the like in summer, troubles such as color changes throughout the film or transfer of characters printed on a bag as a container of the film onto the film may occur.

However, the commercially available heat developable photosensitive materials involve the problem in the image preserving property that causes fogging by light and heat after development.

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